when user insert username & password should reach viewdb.php page but in followin error appear :Warning: Cannot modify header information - headers already sent by (output started at /home/umma/public_html/db/config.php:5) in /home/umma/public_html/db/login.php on line 57

Warning: Cannot modify header information - headers already sent by (output started at /home/umma/public_html/db/config.php:5) in /home/umma/public_html/db/login.php on line 58

Warning: Cannot modify header information - headers already sent by (output started at /home/umma/public_html/db/config.php:5) in /home/umma/public_html/db/login.php on line 61